Carburetor system



Sept. 18, 1934. C. I. JUSTHEIM ET AL- CARBURETOR SYSTEM i-"iled Nov. 21, 1932 ill 1111/ III/I II II III/ CL ARENGE JUSTHE/M JEAN G. STAFFORD Patented Sept. 18, 1934 I D STA Our invention; relates to, carburetion devices and systems and has for its object to provide a new and efficient system for drawing the fuel from the main supply tank, mixingpit with the 'L. proper amount of air and introducing it into the intake manifold in a down draft suction device where it is completely carburetted.

A further object is to provide a down draft carburetor, improved over other types of down 'i draft carburetors in that the fuel is introduced into the device in a form so that there will be no flooding of the device and so that the fuel vapors will be picked up and completely carburetted in the suction device, giving greater '1 mileage and better power than with the usual carburetting system.

A still further object is to provide acarburetting system in which the fuel is drawn from the main fuel supply tank by the suction of the Imixing device in a balanced chamber and thence drawn into the suction device for carburetion.

A still further object is to provide a fuel suction carburetion device which mixes the fuel and which is controlled to shut off some of the ports when idling and open the ports for high speed and power.

These objects we accomplish with the device illustrated in the accompanying drawing in which similar numerals and letters of reference indicate like parts throughout the several views and as described in the specification forming a part of this application and pointed out in the appended claim.

In the drawing we have shown Figure 1 as a diametrical vertical section through the suction device and balanced suction fuel tank.

Figure 2 is a section on line 22 of Figure 1.

Figure 3 is a section of a modified form of con- ,trol for the ports from that shown in Figure 2.

In the drawing in Figure l, we have shown the carburetion device as A made of opposed frustoconical chambers l and 2, joined together by a curved wall 3, with the inner walls of the chamber 1 joined tangentially to the curved wall 3 and with the free end of the chamberl joined to an intake manifold 5 of an internal combustion engine. The outer end of the chamber 2 is larger diametered than the outer end of ithe chamber 1 and is joined to a horizontal step 6, which in turn is joined to a chamber 7, the walls 8 of which chamber are vertical and parallel, but at right angles to the wall 6. Ports 9 are bored through the vertical walls 8 adjacent the step 6 into the interior of the chamber 7 and surrounding the step 6- .and the toast an annularchamber10.- The chamberlO'is connectedwi-th-a balanced fuel supply .chamber or tank B bypipe 11, said pipe passing into the top or cover of the tank B, never entering the fuel in the tank. Ports 12 are bored through the smallest bore of the chamber 1, or preferably at that juncture of the curved wall to the tapered wall of the chamber 1. Surrounding the ports 12, we then provide another annular chamber 13, said chamber having a pipe 13a leading therefrom into the bottom of the supply tank B, into the body of fuel at all times. Ihis supplies the chamber 13 with fuel from the tank. The ports 12 are controlled by providing annular milled seat 14 therearound on the outer surface of the walls 15 of the chamber 1, said walls 15 being formed parallel to each other. I then provide a spring control valve 1'7 secured in the mill cut 14, adapted to seat in the milled cut when suction through the device is greatest, closing off the ports 12. A port 18 is bored through the milled cut to provide for idling fuel and this port is not closed off by the spring valve 17. The valve 17 is similar to a clock spring and may be secured at the end of the spring with one end free or may be secured medially thereof as shown in Figure 2, with two ends free and with the idling port 18 therebetween. In Figure 3 we have shown the spring valve separated into seperate valves 19, 20 and 21, with the port 22 the idling port.

The chamber tank B of the device is secured to the body of the suction device A and is pro-' vided with a pipe 23 leading to the main fuel supply tank C to draw fuel from the tank to the chamber B by the suction therein created. A valve 24 controls the flow of the fuel through a port 25 and a float 26 actuates the valve 24, opening or closing the port 25, depending upon the level of the fuel in the chamber tank B. An automatic spring controlled atmospheric valve 28 balances the pressures and suctions in the tank B so that when the fuel level is high enough to shut off the flow of fuel thereinto there will be no vacuum created above the fuel in the tank B. V

The fuel for the device is drawn through the pipe 13a and the suction through the ports 9, the chamber 10 and the pipe 11 creates sufficient suction in the space over the fuel in the tank to draw fuel from the main supply tank G into the tank B and when such suction is too great the suction is broken bythe valve 28. The valve fuel is drawn therethrough, as only the idling port will be open and the ,valve 35 will be closed.

As the valve 35 is opened the suctiondecreases allowing the valve, 17 to open commensuratelyr with the suction, thereby, drawing fuel through the ports 12, the amount of fuel depending upon the suction through the device and the'opening of the valve 1'7.

- Having thus described our invention we desireto "secure by Letters Patent and claim:

in a. device'of the class described the comrounding said ports;

bination of a fuel suction device formed of a frusto-conical chamber joined to an opposed frusto-conical chamber by a curved wall; ports through the juncture of the curved wall to one frusto-conical chamber; an annular chamber surrounding said ports; valves to control the flow of fuel through said ports; a step joining one frusto conical chamber with a cylindrical chamber; ports through the cylindrical chamber adjacent the step; an annular chamber sura fuel supply chamber mounted adjacent said suction device; a lead line from the top of said fuel chamber leading to the annu1ar chamber around the ports in the cylindrical chamber to create suction over the fuel in the supply chamber; a lead line connecting the fuel in the chamber with the first "mentioned annular chamber;

and a valve to balance the pressure and suction in the fuel chamber.

" CLARENCE I. JUSTHEIM.

J. C. STAFFORD. 

